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Investigation of the Mechanical Properties and Machinability of Fluorphlogopite-Gehlenite Glass-Ceramics
B. Eftekhari Yekta1, Z. Hamnabard2
1 Ceramic Division, Department of Materials, Iran University of Science & Technology, Tehran, Iran
2 Ceramic Division, Materials & Energy Research Centre, Tehran, Iran
received July 23, 2013, received in revised form November 10, 2013, accepted November 20, 2013
Vol. 4, No. 4, Pages 193-196 DOI: 10.4416/JCST2013-00019
Abstract
The gradual addition of CaO to a SiO2-Al2O3-B2O3-MgO-K2O-F glass-ceramic composition led to the precipitation of gehlenite crystals and the formation of a potassium-calcium solid solution of fine mica crystals. The above additions almost tripled the bending strength and led to a ∼ 1.5-fold increase in the fracture toughness of the glass-ceramic specimens. When the amount of CaO reached 30 weight parts, the microhardness of glass-ceramic specimens was considerably reduced while their machinability was improved.
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Keywords
Mechanical properties, glasses
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